Some 15 percent of US broadband households now get all of their TV from an antenna. That number has increased steadily over the course of five years as pay TV subscriptions have seen a corresponding drop.

Parks Associates says cord-cutters are gaining ground because of a lack of satisfaction with traditional cable service. Brett Sappington, senior director of research at Parks Associates, said in a blog post that "live broadcasts of high-profile events remain a challenge for online delivery, though pay TV and broadcast TV conquered live distribution long ago."

With lots of antenna options out there for those looking to cut the cord, the reasons to stay with a cable subscription you don't like are shrinking.

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